<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by postman &raquo;</TD></TR><TR><TD CLASS="quote">damn read a recnt artice in a mag, where instead of coating just retreated the surface and it showed better results than most coatings. wish i could remember. </TD></TR></TABLE>Yeah, I agree. We had a company come to our shop and do a presentation on the most bad *** treatment I have ever seen. It adds absolutely no size to a bearing or piston but makes it slippery beyond belief. It is installed kind of like shot peening but the process is not cheap.

 

thats what im talking about. they make the dimpling on the surface much smaller to reduce heat points

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl &raquo;</TD></TR><TR><TD CLASS="quote">Skirt coating just wears off over time and then you have an extra .002" piston to wall clearance and piston slap as a bonus.
Dome coating can save the piston top slightly in a melt down. However the heat has to be absorbed somewhere so it melts your head instead. I would rather lose a piston than a head.
Nothing I have ever read or heard has ever convinced me that coatings help a turbo motor. However, if I had an all motor race car, with the motor coming out every 10 passes, I would consider some of the short term benefits of coatings. </TD></TR></TABLE>

EARL ..Please do some research about what Molyb does before you keep telling people it wears off..
It impregnates into the skirt and is used to RETAIN OIL to the piston wall so it wont squish out on side load or expansion. I tell all my customers to BORE AND HONE BEFORE COATING.. I also tell them if they want to, burnish the coating down with scotchbrite after coating to get back to the original piston to wall prior to coating. This however is not needed as the coating itself will burnish itself down to the machined diameter of the piston eventually without any galling of the parallel material but that in NO WAY means that its not there and doing its job just because YOU cant see it..
This isn't some coating that was developed for race cars, this is the stuff use by NASA and the FAA in all aeronautical equipment.
Its purpose is to be a dry film lubricant in the event of oil starvation as well as an fluid retainer to keep oil from being pressed off the coated part.. It can handle over 350,000 psi before it will even flinch.
It should also be noted that if you coat the dome of the piston that the overall piston to wall clearance can be minimized because the piston will run cooler because the piston wont heat soak and expand. Dome coating also controls hot spotting and distributes the heat across the dome of the piston evenly.
by keeping the heat on the top of the coating it allows the heat to push down the piston harder and faster because its not heat transferring down the piston and rod to the crank.
Other benefits of dome coatings are.
cooler oil temps
cooler water temps
cooler rod bearings
cooler pistons.
It also has been proven to increase gas mileage and POWER because the heated gassed com bust faster and move quicker. This aids in the evacuation of the cylinder once the ex valve opens and helps carry the now hotter gasses out.

And one last thing regarding your comment Earl, if your pistons are melting instead of your head and you coat the piston and now the head melts, Don't you think it might be in fact your poor tuning that's causing things to melt instead of blaming the parts themselves??? Every melted piston or head Ive seen has been a result of poor calculations in tuning.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl &raquo;</TD></TR><TR><TD CLASS="quote">Yeah, I agree. We had a company come to our shop and do a presentation on the most bad *** treatment I have ever seen. It adds absolutely no size to a bearing or piston but makes it slippery beyond belief. It is installed kind of like shot peening but the process is not cheap. </TD></TR></TABLE>
Yeah it uses ceramic beads. The ultimate setup would to do that and then moly coat on top of the skirts and thermal barrier dome coat the domes.

 

my pistons were done by tom, and cant wait to get the motor running.

 

Tbone,
would you say if the gas ports seen in the picture (first page, first reply) have any merit in a turbocharged engine?

 

very good info, thank you for the details!

 

Tom, great read.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Oyvind Ryeng &raquo;</TD></TR><TR><TD CLASS="quote">Tbone,
would you say if the gas ports seen in the picture (first page, first reply) have any merit in a turbocharged engine?</TD></TR></TABLE>

No I wouldnt do it. They aid in ring seal by forcing the top ring outward for better sealing in Na apps. In boosted apps I think they can trap gasses and create a hot spot and melt the top of the ring and land..
I have seen it done with not much sucess. The motors never lasted more then a few months ..I think the gas ports might have helped their demise..

 

Good thread. A lot of current OEM motors come with the skirts coated from the factory. I know Acura does on their v6, don't know about the 4's. You could even take it a step further and have your bearings coated as well. Anything to reduce friction is a benifit. I'm surprised at all the builds I've seen on here, that the majority doesn't go the extra step and have this process done. The thermal coating on the dome, IMO, is an important step for engine longivity and performance. Some of you may have heard of them, but here is another company that specializes in coatings. http://www.calicocoatings.com

here's one done by them and is going into a hondav6
[IMG][/IMG]

 

Moly skirts and Thermal coated tops by Swaintech.

 

This is where I had my pistons coated..it cost 128.00 for tops and sides my setup is turbo and I also had my combustion chambers and ss valves coated..

You are not going to make, see or feel a difference after getting something coated it is basically extra insurance if you understand "charge density" then you will understand why people coat their pistons, even larry at endyn coats his pistons it allows him to run higher compression or higher boost and cuts down on the chances of cracking a head or damage to a piston..

Probably one of the best advantages is that you can run you motor longer and harder with a decreased chance of metal distortion..look at what all the 03/04 cobra owners are doing when they rebuild their motors..95% of them are coating the pistons,combustion chambers and valves..

It is all about keeping the engine cool.. and keeping it in a safe operating temp..goes with the same principle as an oil cooler .

 

here is where I had mine done

http://www.engineceramics.com/index.html

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">Moly skirts and Thermal coated tops by Swaintech.
</TD></TR></TABLE>

I plan on doing this I'll never knock Swaintech, they mean buisness.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90blackcrx &raquo;</TD></TR><TR><TD CLASS="quote">

George Costanza, no wait
https://honda-tech.com/zero...=6457</TD></TR></TABLE>

LMAO T-Bone....T-Bone....T-Bone